Question

2/a,b,c,d Pls repede.

Answer 1

2

a)

5√2·x -7√2·x +9√2·x = x·√2 ( 5 - 7 + 9 ) = 7√2·x

b)

-4√3·y + √12·y + 2√27·y =

=-4√3· y + √(3·2²)·y + 2√3³·y =

=√3·y· ( -4 + 2 + 6)

= 4√3·y

c)

-3√(20)·x² -2√(125) ·x² + 6 √(45) x²=

-3√(2²·5)·x² -2√(5³) ·x² + 6 √(3²·5) x²=

-3·2√(5)·x² -2·5√(5) ·x² + 6·3 √(5) x²=

-6√(5)·x² -10√(5) ·x² + 18 √(5) x²=

√(5)·x²· ( - 6 - 10 + 18 )=

= 2√5·x²

d)

5√6·xy - 3(√24)·xy + 2√(96)·xy =

5√6·xy - 3(√6·2²)·xy + 2√(2⁵·3)·xy =

5√6·xy - 3·2√6·xy + 2·2²√6·xy =

√6·xy· ( 5 - 6 + 8) = 7√6 · xy