Question

А) -3a²+b при a= -2, b= 5
Б) 13x-26y при x=2,4, y= -3,8

Answer 1

$a) - 3 \times {( - 2)}^{2} + 5 = - 3 \times 4 + 5 = - 12 + 5 = - 7 \\ b)13 \times 2.4 - 26 \times ( - 3.8) = 31.2 + 98.8 = 130$