Seatwork: Evaluate the following algebraic expressions:
1.) 4y if y=-5
2.)5b-7 if b=8
3.)6x+5y if x=-4, y=-3
4.)a^{2}+2b if a=4 , b=-3
5.)(m+n)^{2} if m=9 and n=-4
1.) 4y if y=-5
2.)5b-7 if b=8
3.)6x+5y if x=-4, y=-3
4.)a^{2}+2b if a=4 , b=-3
5.)(m+n)^{2} if m=9 and n=-4
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Answer:
1.) -20
2.) 33
3.) -39
4.) 10
5.)25
solution:
1.
= 4(-5)=-20
2.
=5(8)-7
=40-7
=33
3.
=6(-4)+5(-3)
= -24-15
= -39
4.
=4²2(-3)
=16-6
=10
5.
=(9-4)²
=(5)²
=25