Question

the common roots of quadratic x2-5z=0 and z2-2z-15=0

Answer 1

Step-by-step explanation:

z2-2z-15=0

z2-5z+3z-15=0

z(z-5)+3(z-5)=0

(z+3)(z-5)=0

z= -3,5

then x2-5z=0

x2-5(5)=0

x= 5

the common roots of the given equation is 5

Answer 2

Step-by-step explanation:

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