Question

Simplify:
4x(x+1)-5x(x-3)+8
Find the value when x=-1

Answer 1

given X= -1

now 4(-1)×(-1+1)-5(-1)×(-1-3)+8

=-12

hope it help you

Answer 2

$\boxed{\boxed{\boxed{\bold{\red{Solution : \longrightarrow}}}}}$

$\bold{Given,}$

$\bold{x = - 1}$

$\bold{The \: \: value \: \: of}$

$\bold{ 4x(x + 1) - 5x(x - 3) + 8} \\ \\ \bold{= 4 {x}^{2} + 4x - 5 {x}^{2} + 15x + 8}$

$\bold{Now \: \: putting \: \: -1 \: \: in\: \: the\: \: place \: \: of \: \: x \: \:\: \: }$

$\bold{= 4 \times( { - 1)}^{2} + 4 \times (-1) - 5 \times ( { - 1)}^{2} + 15 \times ( - 1) + 8} \\ \\ \bold{= 4 \times 1 +( - 4) - 5 \times 1 +( - 15 )+ 8} \\ \\ \bold{= 4 - 4 - 5 - 15 + 8} \\ \\ \bold{= - 12}\: \: \: \boxed{\bold{\red{Ans}}}$