Question

If a= 3 and b = -2, then find the value of 5a^2 -2ab + 6b^3

Answer 1

Answer:

$5 {a}^{2} - 2ab + 6 {b}^{3} = 9$

Step-by-step explanation:

$a = 3 \: and \: b = - 2 \\ 5 {a}^{2} - 2ab + 6 {b}^{3} \\ (5 \times {3}^{2}) - (2 \times 3 \times - 2) + (6 \times { - 2}^{3} ) \\ 5 \times 9+ 12 + 6 \times -8\\ 45 + 12 -48 \\ 9$