Question

Verify that
a = 5
b = 4
a3 + b3 = a2 + b2 + ab

Answer 1

Step-by-step explanation:

SOLUTION

a³ + b³ = (a + b) (a² - ab + b²)

=> 5³ + 4³ = (5 + 4) (5² - 4×5 + 4²)

=> 125 + 64 = 9 (25 - 20 + 16)

=> 189 = 225 - 180 + 144

=> 189 = 369 - 180

=> 189 = 189

Verified

First Learn formula

a³ + b³ = (a + b) (a² - ab + b²)

a³ - b³ = (a - b) (a² + ab + b²)

Answer 2

Answer:

a³+b³=a²+b²+ab

5³+4³=5²+4²+5×4

125+64=25+16+20

189≠61