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Mathematics
Sage Bradford
7 May, 08:13
Answer this question (x - 2) (x + 5) = 18
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Giovanny Boyd
7 May, 12:09
0
x=-7 x=4
Step-by-step explanation:
(x - 2) (x + 5) = 18
Foil
x^2 + 5x-2x-10 = 18
Combine like terms
x^2 + 3x - 10 = 18
Subtract 18 from each side
x^2 + 3x - 28 = 0
Factor
What two numbers multiply to - 28 and add to 3: 7 and - 4
(x+7) (x-4) = 0
Using the zero product property
x+7=0 x-4 = 0
x=-7 x=4
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