Evaluate each expression for a 1 and b 5 5a7 2b3a ab2 Simp

Evaluate each expression for a = -1 and b = 5. 5a-7 -2b-3a (ab)^2 Simplify each expression. 9xy^2 - 11xy^2 15 - (-3)-2^2 -1/4 (-4 + 2p)

23. 5a -7

= 5*(-1) -7 = -12

24 . -2b -3a = -2(5) -3( -1)

= -10 +3 = -7

25 (ab)^2 = ( -1*5)^2 = 25

26 9xy^2 - 11xy^2

= -2xy^2

27 15 - (-3) -2^2

= 15 +3 - 4

= 14