Question

What is the value of the expression when a is 5 and b is 3 4a^2-5b^2

Answer 1

So that gives you
4×5^2-5×3^2
First you have to do the exponents
5^2=25
3^2=9
Now you have 4×25-5×9
4×25=100
5×9=45
100-45=55
55 is the answer.