ACT Math · Number operations and exponents

What is the value of -2² + 3(-1)³?

What is the value of −22+3(−1)3-2^2 + 3(-1)^3?

Answer and explanation

Answer: F: -7

Follow the order of operations: exponents come before multiplication, and the negative sign in −22-2^2 is not squared, because the exponent applies only to 22. So −22=−(4)=−4-2^2=-(4)=-4. Next, (−1)3=−1(-1)^3=-1, so 3(−1)=−33(-1)=-3. Then −4+(−3)=−7-4+(-3)=-7, choice F. Choice G (11) treats −22-2^2 as (−2)2=4(-2)^2=4 and keeps −3-3, giving 4−34-3. Choice H (77) squares the negative and also changes the sign of the second term, 4+34+3. Choice J (−1-1) uses −4+3-4+3, a sign error on the second term.

More Number operations and exponents questions

All Number operations and exponents questions

Learn the method behind questions like this one

The ACT Math course teaches each tested skill through lessons, step-by-step solutions to sample problems, the complete study guide and full-length practice tests.