Thejollyhellhound20
01.07.2020 •
Mathematics
which of the following are solutions to the equation below check all that apply 2x^2 +6x = 20 A) 2 B) -10 C) 1 D) 20 E) -5 F) -2
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Ответ:
A. x = 2
E. x = -5
Step-by-step explanation:
Step 1: GCF
2(x² + 3x) = 20
x² + 3x = 10
Step 2: Complete the Square
x² + 3x + 9/4 = 10 + 9/4
(x + 3/2)² = 49/4
Step 3: Solve
√(x + 3/2)² = √49/4
x + 3/2 = ±7/2
x = -3/2±7/2 or x = -5, 2
Ответ:
A,C,E are correct according to the graph