Help me solve this please. Factor the expression 16a2

Science & Mathematics by Anonymous 2018-05-18 11:07:04

Social Science

Help me solve this please. Factor the expression 16a2 - 81?

6 answers

Anonymous
Anonymous

16a^2 - 81 = (4a)^2 - (9)^2 = (4a - 9)(4a + 9)
Anonymous

16a^2 - 81 = (4a + 9)(4a - 9)
Anonymous

(4a+9)(4a-9)
Anonymous

16 = 4^2 I guess you mean a^2 (a to the power of 2 and 81 = 9^2 so 16a^2 - 81 = (4a)^2 - 9^2 = (4a + 9)(4a - 9)
Anonymous

Difference of squares 16a² - 81 = (4a)² - 9² = (4a+9) (4a-9)