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Toán Lớp 10: a) x2+6x-3=0 b) x2-4=0 c)x2-5x+9=0

Home/ Toán Lớp 10: a) x2+6x-3=0 b) x2-4=0 c)x2-5x+9=0

Toán Lớp 10: a) x2+6x-3=0 b) x2-4=0 c)x2-5x+9=0

Kim Duyên Tháng Chín 18, 2022 Toán học 1 Comment 0 views

Toán Lớp 10: a) x2+6x-3=0
b) x2-4=0
c)x2-5x+9=0

Comments ( 1 )

thanhtung
18 Tháng Chín, 2022 at 3:40 chiều

Reply

x²+6x-3=0

x²-3x+9x-3=0

x(x-3)+3(x-3)=0

(x-3)(x+3)=0

$\left \{ {{x-3=0} \atop {x+3=0}} \right.$ ⇒$\left \{ {{x=3} \atop {x=-3}} \right.$

b, x²-4=0

(x-2)(x+2)=0

$\left \{ {{x-2=0} \atop {x+2=0}} \right.$ ⇒$\left \{ {{x=2} \atop {x=-2}} \right.$

c, x²-5x+9=0

x²+5x=9

x(x+5)=9

$\left \{ {{x=3} \atop {x+5=3}} \right.$ ⇒$\left \{ {{x=3} \atop {x=-2}} \right.$

Cho mk xin hay nhất please

Thank you

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