michellewilliam michellewilliam

08-09-2014
Mathematics

contestada

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

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konrad509 konrad509

08-09-2014

[tex]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[/tex]

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