Question

simplify the expressions 2(x²+xy)+7-xy and find it's value when x-7 And y=-2​

Answer 1

Step-by-step explanation:

solution ------>

given

$2( {x}^{2} + xy) + 7 - xy \\ \\ as \: per \: condition \\ \\ x - 7 = 0 \\ x = 7 \\ \\ y = - 2 \\ \\ put \: all \: the \: value \: of \: x \: and \: y \\ \\ 2( {7}^{2} + 7 \times - 2) + 7 - 7 \times - 2 \\ \\ 2(49 - 14) + 7 + 14 \\ \\ 2 \times 35 + 21 \\ \\ 70 + 21 \\ \\ 91$

for simplification:-

$2( {x}^{2} + xy) + 7 - xy \\ \\ 2 {x }^{2} + 2xy + 7 - xy \\ \\ 2 {x }^{2} + xy + 7$

Answer 2

answer

y=-2 given

x-7=0 so,x=7

2 (7×7+7× -2 ) +7- (7× -2)

2 ( 49 -14) +7 -(-14)

2 (35)+7+14

70+21

=91