Multiply (2r+5) by (r+3) through foil method...
First Term: 2r and r=2 r^{2}
Outer Term: 2r and 3=6r
Inner Term: 5 and r= 5r
Last Term: 3 and 5= 15
So (2r+5)(r+3)=2 r^{2} +6r+5r+15 (You can add 5r and 6r and it will result in 2 r^{2} +11r=15.
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salamat po though tapos na. komawo :D
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