Core stretch The expression $2.4x^2+1.4x-2$ can be written as $0.2(ax+b)(cx+d)$, where $a,c0$

Question

Core stretch The expression $2.4x^2+1.4x-2$ can be written as $0.2(ax+b)(cx+d)$, where $a,c>0$, $a,b,c,d$ are integers and the coefficients in each binomial have no common factor greater than 1. Find $a+b+c+d$.

Accepted Answer

$10$.

Normalised decimal factorisation

Normalised decimal factorisation

Solution:

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