Question

Which two equations would be most appropriately solved by using the quadratic formula? Select each correct answer. A: 5x2+7x=15 B: (x+8)(x+9)=0 C: (x−3)2=36 D: 0.25x2+0.8x−8=0

Answer 1

a and d

Explanation:

i took the k12 quiz

Answer 2

we have that

A:) 5x²+7x=15------------>5x²+7x-15=0
is appropriately solved by using the quadratic formula because the solution is not direct

B:) (x+8)(x+9)=0
is not appropriately solved by using the quadratic formula because the solution is direct
the solution is
x=-8
x=-9

C:) (x−3)²=36----------> (x−3)²=6²
is not appropriately solved by using the quadratic formula because the solution is direct
the solution is
x=-3
x=9

D:) 0.25x2+0.8x−8=0is appropriately solved by using the quadratic formula because the solution is not direct

the answer is
the option A) and option D)