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Akimi4 [234]
3 years ago
10

Solve the problem. give that f(x)=4x²-7x;find all values of a such that f(a)=15 HELP!!!

Mathematics
1 answer:
joja [24]3 years ago
7 0
4x^2-7x=15\\
4x^2-7x-15=0\\
4x^2-12x+5x-15=0\\
4x(x-3)+5(x-3)=0\\
(4x+5)(x-3)=0\\
x=-\frac{5}{4} \vee x=3
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