Question

(5a−11b)⋅(5a+11b)−25a2,если a=2 и b=0,1.​

Answer 1

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Answer 2

To find the value of the expression (5a−11b)⋅(5a+11b)−25a^2 when a = 2 and b = 0.1, we substitute the values of a and b into the expression and perform the calculations.

First, let's substitute the values of a and b into the expression:

(5(2)−11(0.1))⋅(5(2)+11(0.1))−25(2)^2

Simplifying further:

(10 − 1.1) ⋅ (10 + 1.1) − 25(4)

Now, calculate the values inside the parentheses:

(8.9) ⋅ (11.1) − 25(4)

Now, perform the multiplications:

98.79 − 100

Finally, subtract 100 from 98.79:

98.79 - 100 = -1.21

Therefore, the value of the expression (5a−11b)⋅(5a+11b)−25a^2, when a = 2 and b = 0.1, is -1.21.