Question

6. Evaluate : 6²-9(b - 1)?, if b = 1.1.
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Answer 1

${6}^{2} - 9(b - 1) \\ \\ = 36 - 9(1.1 ) \\ \\ = 36 \ - 9.9 \\ \ \\ = 26.1$

Answer 2

1.1^2-9(1.1-1)^2

1.21-9(0.1)^2

=1.21-9×0.01

=1.21-0.09=1.12