Tìm x1)\(\left(x-2\right)^2-\left(x-3\right)\left(x+3\right)=17\)2)\(\left(2x+3\right)^2-\left(2x-1\right)\left(2x+1\right)=10\)3)\(x^2+6x-247=0\)4)\(\left(3x-5\right)\left(2x+3\right)-6x^2=7\)5)\(\left(x-4\right)^2-\left(x-2\right)\left(x+2\right)=36\) AI GIÚP MK VỚI CHIỀU NAY TUI KIỂM TRA...
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Tìm x
1)\(\left(x-2\right)^2-\left(x-3\right)\left(x+3\right)=17\)
2)\(\left(2x+3\right)^2-\left(2x-1\right)\left(2x+1\right)=10\)
3)\(x^2+6x-247=0\)
4)\(\left(3x-5\right)\left(2x+3\right)-6x^2=7\)
5)\(\left(x-4\right)^2-\left(x-2\right)\left(x+2\right)=36\)
AI GIÚP MK VỚI CHIỀU NAY TUI KIỂM TRA RÙI
1) (x - 2)2 - (x - 3)(x + 3) = 17
=> x2 - 4x + 4 - x2 + 9 = 17
=> -4x = 17 - 13
=> -4x = 4
=> x = -1
2) TTT
3) x2 + 6x - 147 = 0
=> x2 + 19x - 13x - 147 = 0
=> x(x + 19) - 13(x + 19) = 0
=> (x - 13)(x + 19) = 0
=> \(\orbr{\begin{cases}x-13=0\\x+19=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=13\\x=-19\end{cases}}\)
4) (3x - 5)(2x + 3) - 6x2 = 7
=> 6x2 + 9x - 10x - 15 - 6x2 = 7
=> -x - 15 = 7
=> -x = 7 + 15
=> -x = 22
=> x = -22
5) TL