Question

Evaluate each expression if a=-2, b=3, and c=4.2

1. a-2b+3c

2. 2a+(b+3)^2

3.a+3[b^2 - (a+c)]

Answer 1

Explanation:

1. a-2b+3c

= -2-2×3+3×4.2

= -2-6+12.6

= -8+12.6

= 4.6

2. 2a+(b+3)²

= 2×(-2)+(3+3)²

= -4+6²

= -4+36

= 32

3. a+3[b²-(a+c)]

= -2+3[3²-(-2+4.2)]

= 1 [ 9-(2.2)]

= 1 [ 9-2.2 ]

= 1 [ 6.8 ]

= 6.8