Question

(x-3)(x-7)-2x(3x-5) пожалуйста

Answer 1

$x^{2} -7x-3x+21-6 x^{2} +10x=-5 x^{2} +21$

Answer 2

Let's simplify the expression using distributive property and combining like terms:

(x-3)(x-7)-2x(3x-5)

= x(x-7) - 3(x-7) - 2x(3x) + 2x(5) // distribute (x-3) and -2x

= x^2 - 7x - 3x + 21 - 6x^2 + 10x // simplify each term

= -5x^2 + 3x + 21 // combine like terms and arrange in descending order of exponents

Therefore, (x-3)(x-7)-2x(3x-5) simplifies to -5x^2 + 3x + 21.