If a b and ( a + b ) ( a +m b ) , then m is equal to

Step-by-step solution

If a and b are perpendicular to each other. array ll Then, & a b=0 & (a+b) (a+m b) & (a+b) (a+m b)=0 & a a+m b b+b a+m a b=0 & |a|²+m|b|²+0+m 0=0 & m=- |a|² |b|² array