Question

Efectuati:a)4x²-5x²-7x²+9x²=
b)√18x-√32x+√50x=
c)18-(7x-9)+(23x-21)=
d)(7x³)*5x^4=
e)3 1
---x²*2---xy*(-2xy²)=
7 3
f)54a³b³:(-6a²b)=

Answer 1

$a) {4x}^{2} - {5x}^{2} - {7x}^{2} + {9x}^{2} = {x}^{2}$

$b) \sqrt{18} x - \sqrt{32} x + \sqrt{50} x$

$= 3 \sqrt{2} x - 4 \sqrt{2} x + 5 \sqrt{2} x$

$= 4 \sqrt{2} x$

$c)18 - (7x - 9) + (23x - 21)$

$= 18 - 7x + 9 + 23x - 21$

$= 16x + 6$

$= 2(8x + 3)$

$f)54 {a}^{3} {b}^{3} \div ( - 6 {a}^{2} b) = - 9a {b}^{2}$