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Algebra 1 questions?

Can someone please tell me if i got these problems correct? and if not which ones are wrong? Im not asking for the answers.

1.) Simplify the expression: x2-4x+4(x2+2x-5)
Answer: 5x2+ 12x-20

2.) Simplify the expression: 5x2+4x-6(3x2-2)
Answer: -13x2+4x-12

3.) Simplify the expression: x2(4x-x+6)
Answer: 3x2+6

4.) Multiply the binomials: (a+b)(a-b)
Answer: a2-b2

5.) Multiply: (4a+x)(3a-x)
Answer: 12a2+7ax -x2

6.) Multiply: h2(5h+4)
Answer: 5h3+4h2

7.) Multiply: (x+3)2
Answer: x2+9

8.) Multiply: (d-5)2
Answer: d2-25

9.) Multiply: (2x2)(x+4)(x-4)
Answer: 2x4-16

10.) Skip.

11.) To graphically solve the quadratic equation x2+3x-10=5 you?
Answer: use the quadratic formula, letting a= 1, b= 3, c= -15

12.) If the garden box has dimensions x by x feet and an area in square feet equal to the perimeter in feet, what is the value of x that satisfies the requirments?
Answer: there is not enough information in the problem

13.) Given three consecutive integers with a sum of four times the second number, write an algerabic equation for this situation.
Answer: 3n+3=4n

14.) Factor the trinomial: b2-b-6
Answer: (b+3)(b-2)

15.) Factor the binomail: x2-64
Answer: (x-8)(x+8)

16.) Factor the binomial: 9a2-16
Answer: (3a-4)(3a+4)

17.) Factor the equation: x2=x+20
Answer: (x+5)(x+4)

18.) Solve the equation x2+5x-4=0 using the quadratic formula.
Answer: x=.702 and -5.702

19.) Solve the equation 3m2+ 6m=3 using thw quadratic formula.
Answer: x= 2.5 and -14.5

** for questions 20 and 21 write the value of the discriminant of each equation decide how many different real number roots the equation has and determine how many point the parabola will intersect wuth the x-axis do not solve equation.


20.) x2+7x+9=0
Answer: discriminant is 13, there are twl real roots,, with the parabola intersecting the x=acis at two points.

21.) 2x2+5x+7=0
Answer: discriminant is -31, there are no real roots, with the parabola not intersecting the x-axis at all.

Thanks if you help, it would be appreciated Im working on practice tests for my final.

181 day(s) ago

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