Question

simplify the expressions and find their values,if x=2,a=-1,b=-3

Question- 4a²-b²+6a²-7b²​

Answer 1

$4a ^ { 2 } -b ^ { 2 } +6b ^ { 2 } -7b ^ { 2 }$

$4a^{2}-2b^{2}$

$2\left(2a^{2}-b^{2}\right)$