Question

(5a+0,7)²-5a(5a+1,4)​

Answer 1

(5a+7/10)2^-25a2^-7a=
25a2^+7a+49/100-25a2^-7a=
(25a2^ и -25a2^ сокращаются)
7a+49/100-7a=
(7a и -7а сокращаются) 49/100=0.49

Answer 2

To simplify the expression (5a+0.7)² - 5a(5a+1.4), we can start by expanding the square of the binomial (5a+0.7)² using the formula:

(a + b)² = a² + 2ab + b²

In this case, we have a = 5a and b = 0.7, so:

(5a + 0.7)² = (5a)² + 2(5a)(0.7) + (0.7)² = 25a² + 7a + 0.49

Next, we can simplify the term 5a(5a+1.4) by distributing the 5a:

5a(5a+1.4) = 25a² + 7a

Substituting these values into the original expression, we get:

(5a+0.7)² - 5a(5a+1.4) = (25a² + 7a + 0.49) - (25a² + 7a) = 0.49

Therefore, the simplified expression is 0.49.