Question

Упростите выражения a)(2a^2-a-1)-(a^2+2) b)(2a^2-a-1)+(a^2+2)

Answer 1

а). 2a^2-a-1-a^2-2=a^2-a-3; b). 2a^2-a-1+a^2+2=3a^2-a+1.

Answer 2

а). 2a^2-a-1-a^2-2=a^2-a-3; b). 2a^2-a-1+a^2+2=3a^2-a+1.

Answer 3

a)

(2a^2 - a - 1) - (a^2 + 2)

= 2a^2 - a - 1 - a^2 - 2 (distribute the negative sign)

= 2a^2 - a^2 - a - 1 - 2 (combine like terms)

= a^2 - a - 3 (simplify)

b)

(2a^2 - a - 1) + (a^2 + 2)

= 2a^2 - a - 1 + a^2 + 2 (distribute the positive sign)

= 2a^2 + a^2 - a - 1 + 2 (combine like terms)

= 3a^2 - a + 1 (simplify)