Question

5a²-7b+5b² from 3ab -2a²-2b².

based on subtraction​

Answer 1

Answer:

10ab -3a2 +7b2

Explaination:

Step-by-step explanation:

+3ab -2a2-2b2

-7ab-5a2+5b2

+ + -

-10ab-3a2+7b2

In substraction the signs are changed and then the are substracted

Answer 2

Explanation:

a = -2 e b = 3, vamos substituir

(a² -4ab +b²)(5a² -3ab -5b²) =

(5a⁴ +12a²b² -5b⁴) =

5.(-2)⁴ + 12.-2².3² - 5.3⁴ =

5. 16 + 12.4.8 - 5.81 =

\ / \ / \ /

80 + 384 - 405 =

\ /

464 - 405 = 59