Question

d) Find the value of the expression
2a2+ 5b2- ab + 10 if a= 1,b= - 1.​

Answer 1

Step-by-step explanation:

$2 \times {a}^{2} + 5 {b}^{2} - ab + 1010 \\ given \: a = 1 \: b = - 1 \\ \\ 2 \times {1}^{2} + 5 \times { - 1}^{2} - ab + 10 \\ 2 \times 1 + 5 \times 1 - ab + 10 \\ 2 + 5 - ab + 10 \\ 2 + 5 + 10 - ab \\ 17 - ab$