Question

TAREA DE MATE
Calcula el valor numérico de las siguientes expresiones algebraicas, si a= -7 , b= 1 y c= 3
 a2 -3b
 2 a+5b -2
 b3-a2 + 2b -1
 5 a3 -6c +2
 4b2 + 10c+a
 -c3 + 9a2 – 2ab
 3a 4 + 8c +8 a2 +5

Answer 1

• (-7)2-3(1)= -14-3= -17

• 2(-7)+ 5(1)-2= -14+5-2= -16+5 = -11

• (1)3-(-7)2+2(1)-1= 3-(-14)+2-1= 3+14+1= 18

• 5(-7×3)-6c+2= 5(-21)-6(3)+2= -105-18+2= -121
• 4(1(2))+10(3)+(-7)= 4(2)+30-7=8+30-7=38-7=31
• -3(3)+9(-7(2))-2(-7)(1)= -9(-14)-2(-7)= +126+14= 140
• 3(-7)4+8(3)+8(-7)2+5= -14(4)+24-56(2)+5= -56+24-112+5= -168+29= -139

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