Question

daca am o greseala ma mai pune sa fac inca 10 exercitii si tot asa va rogg mult sa ma ajutatii!
ofer punctaj mare

Answer 1

1)
7x(3x²-5x-3)=21x³-35x²-21x
(4x-5)(4x+5)=16x²-25
(2x+7)(2x-7)=4x²-49
(5x-3)(5x+3)=25x²-9
(x-3)²=x²-6x+9
(2x+7)²=4x²+28x+49
(5x-2)²=25x²-20x+4
(√3+5)²=3+10√3+25=28+10√3
(√2-√3)²=2-2√6+3=5-√6
(√7+2)(√7-2)=7-4=3
2.
7x²-14x=7x(x-2)
2x²-18=2(x²-9)
x²+2x+1=(x+1)²
7x²-63=7(x²-9)