21
Plug the number 2 into the equation.
4(2+2)+5
4*4+5
16+5
21
Answer:
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Step-by-step explanation:
14 I think but I’m not 100% sure. Because the smaller triangle should be half of the bigger triangle. And since the smaller triangle gives you 7, 7 x 2= 14.
Answer:
es 3/54 eso da My brother
Expand the brackets: x²+5x+6=kx+2. So x²+(5-k)x=-4.
To complete the square on the left we add ((5-k)/2)² to each side:
(x+(5-k)/2)²=((5-k)/2)²-4.
Take a look at the right hand side: when this is zero we have equal roots:
((5-k)/2)²=4, (5-k)/2=±2, 5-k=±4, k=5∓4, giving us k=1 or 9.
(5-k)/2 is 2 or -2. So if k=9, (x-2)²=0. And x=2 is the positive root.
