book Maths Puzzle Numerical Ability

(7-6i)+(9+11i)

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book Other Question

What is the vertex of y=x2-4+2
What is the discrimint
Thank you so much for your help with this. My brain stopped and I need a push. Can you bring me through this problem please...
"Use a quadratic equation to determine the two numbers that satisfy the situation: Their sum is 9 and their product is 20."?