Toán Lớp 8: Bài 1 : rút gọn biểu thức:
a)A=(x-5).(x+5)-(x^2-7)
b)B=(x-1)^2-(x+3)^2
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Toán Lớp 8: Bài 1 : rút gọn biểu thức:
a)A=(x-5).(x+5)-(x^2-7)
b)B=(x-1)^2-(x+3)^2
Comments ( 2 )
$A = x^2 – 25 – x^2 + 7$
$A = – 22$
$b, B = (x-1)^2 – (x+3)^2$
$B = x^2 -2x + 1 – (x^2 + 6x +9)$
$B = x^2 -2x + 1 – x^2 -6x -9$
$B = -8x – 8$