Question

ma ajutati la ex 4 va rog ​

Answer 1

La toate subpunctele se foloseşte formula: (x-y)(x+y) = x²-y²

a) (x+3)(x-3) = x²-9

b) (a-2)(a+2) = a²-4

c) (b-4)(b+4) = b²-16

d) (2a+5b)(2a-5b) = 4a²-25b²

e) (6a+5)(6a-5) = 36a²-25

f) (5x-1)(5x+1) = 25x²-1

g) (8x+5)(8x-5) = 64x²-25

h) (7x-3)(7x+3) = 49x²-9

i) (2x-3y)(2x+3y) = 4x²-9y²

j) (4x+9)(4x-9) = 16x²-81

k) (5x+6)(5x-6) = 25x²-36

l) (3x+8)(3x-8) = 9x²-64