Question

Solve:-
${4a}^{2} - {b}^{2} +{6a}^{2} - {7b}^{2}$
if
a = 2
b = -1 ​

Answer 1

Answer:

4a²-b²+6a²-7b²

4a²+6a²-b²-7b2

10a²-8b²

10×4-8×1

40-8

32

Answer 2

Step-by-step explanation:

4a² – b² + 6a² – 7b²

a = 2 and b= -1

=4(2)² – (-1)² + 6(2)² – 7(-1)²

=4×4-1+6×4-7+1

=16-1+24-6

=15+18

=33