Question

Find the value of expression 7a^2 – 4b^3 for a = 3, b = 2.​

Answer 1

Step-by-step explanation:

$7a { }^{2} - 4b {}^{2}$

$7 \times 3 {}^{2} - 4 \times 2 {}^{2}$

$7 \times 9 - 4 \times 4$

$63 - 16$

$47$