The expression 2b x 5b can be simplified by multiplying the coefficients (2 and 5) together to get 10, and then multiplying the variables (b and b) together to get b^2. Therefore, the answer is 10b^2.
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-b+5b-2b=2b
No. 7b - 2b = 5b
8b + 11 - 3b = 2b + 2 5b + 11 = 2b + 2 5b - 2b = 2 - 11 3b = -9 b = -3
Let a + bi be the reciprocal. So (a + bi)(2 - 5i) = 1 (a + bi)(2 - 5i) = 2a - 5ai + 2bi + 5b = (2a + 5b) + (2b - 5a)i Therefore 2a + 5b = 1 and 2b - 5a = 0. Solving the simultaneous equations, we find that a = 2/29 and b = 5/29. So the reciprocal of 2 - 5i is 2/29 + 5i/29.
b2 x 2b = 2b3