28. perform the indicated operations. simplify your answer a. (x+3)(2x-1) b. (x+5)(x-5) c. (x+2)^2 d. (2x^2 +11x- + 6) 29. convert to scientific notation a. 0.125 b. 435,000 30. factor 3x +x-4 31. factor 4x^2 -16y= 32, factor x+8=33. solve the equation x^2-2x-15 = 0 34. simplify 35. perform the indicated operations. simplify your answer x^2+4x +4 a. 3x+2x^2 5x15r x-2 x +1 3x +34 45

yess

step-by-step explanation:

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~coco

step-by-step explanation:

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x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x