If k √28+√63-√7=0 find k

Answer 1

k = -1

ksqr28 + sqr63 - sqr7 = 0

ksqr28 +sqr63 - sqr7 = 0

factor out sqr7 to get

sqr7( ksqr4 + sqr9 - sqr1) = 0

sqr7(2k +3 -1) = 0

sqr7(2k+2) = 0

2k+2 = 0

k+1 = 0

k = -1

-1sqr28 + sqr63 - sqr7

= -sqr7sqr4 + sqr7sqr9 - sqr7

= =-2sqr7 + 3sqr7 -sqr7

= (-2 +3 -1)sqr7

= (0)sqr7

= 0