Question

5ab - 7b + 5a в квадрате - 7a если а=3,7 b=-3.7

Answer 1

5ab-7b+5a²-7a=5a(b+a)-7(b+a)=(b+a)(5a-7)=(-3,7+3,7)(5*3,7-7)=0

Answer 2

To evaluate the expression 5ab - 7b + 5a^2 - 7a when a = 3.7 and b = -3.7, we substitute the given values into the expression and simplify:

Substituting a = 3.7 and b = -3.7:

5(3.7)(-3.7) - 7(-3.7) + 5(3.7)^2 - 7(3.7)

Using a calculator or performing the calculations step by step:

= -68.55 - (-25.9) + 68.55 - 25.9 = -68.55 + 25.9 + 68.55 - 25.9 = 0

Therefore, when a = 3.7 and b = -3.7, the expression 5ab - 7b + 5a^2 - 7a evaluates to 0.