Ответ:
1) -12y^2 -76y 2)x1 = [tex]\frac{15-\sqrt{321} }{16}[/tex]; x2 = [tex]\frac{15+\sqrt{321} }{16}[/tex]
Объяснение:
1.
2у(3у – 2) – 18у(4 + у)
2y((3y-2) - 9(4+y))
2y(3y-2-36-9y)
2y(-6y-38)
-12y^2 -76y
2.
(4х + 5)2 + (3 – 2х)(8х + 1) = 7
8x+10+(24x+3-16x^2-2x)-7=0
8x+10+24x+3-16x^2-2x-7=0
-16x^2+30x+6=0
16x^2-30x-6=0
8x^2-15x-3=0
D=225+4*3*8=321
x1 = [tex]\frac{15-\sqrt{321} }{16}[/tex]
x2 = [tex]\frac{15+\sqrt{321} }{16}[/tex]
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Ответ:
1) -12y^2 -76y 2)x1 = [tex]\frac{15-\sqrt{321} }{16}[/tex]; x2 = [tex]\frac{15+\sqrt{321} }{16}[/tex]
Объяснение:
1.
2у(3у – 2) – 18у(4 + у)
2y((3y-2) - 9(4+y))
2y(3y-2-36-9y)
2y(-6y-38)
-12y^2 -76y
2.
(4х + 5)2 + (3 – 2х)(8х + 1) = 7
8x+10+(24x+3-16x^2-2x)-7=0
8x+10+24x+3-16x^2-2x-7=0
-16x^2+30x+6=0
16x^2-30x-6=0
8x^2-15x-3=0
D=225+4*3*8=321
x1 = [tex]\frac{15-\sqrt{321} }{16}[/tex]
x2 = [tex]\frac{15+\sqrt{321} }{16}[/tex]