Toán Lớp 9: giải hộ pt : căn 4x + 4 + căn 9x + 9 = 5
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Toán Lớp 9: giải hộ pt : căn 4x + 4 + căn 9x + 9 = 5
Comments ( 2 )
⇔\sqrt{4(x+1)} + \sqrt{9(x+1)} = 5
⇔ x = 0(tmdk)
$⇔\sqrt[]{4(x+1)}+\sqrt[]{9(x+1)}=5$
$⇔\sqrt[]{2^2(x+1)}+\sqrt[]{3^2(x+1)}=5$
$⇔2\sqrt[]{x+1}+3\sqrt[]{x+1}=5$
$⇔5\sqrt[]{x+1}=5$
$⇔\sqrt[]{x+1}=1$
$⇔x+1=1$
$⇔x=0,tm$