1.

2 X square + 9 X Y + 9 y square​

Answer»

4x²+9y²+16z²+12xy-24yz-16xz

= (2X)²+(3Y)²+(-4Z)²+2[(2x)(3y)+(3y)(-4z)+(-4z)(2x)]

=(2x+3y-4z)²

= (2x+3y-4z) (2x+3y-4z)

h1{ text-transform:uppercase; margin-top:90px; text-align:center; font-family:Courier new,monospace; border:3px solid rgb(60,45,8); border-top:none; width:67%; letter-spacing:-6px; box-sizing:border-box; padding-right:5px; border-radius:6px; font-size:35px; font-weight:bold; } h1 span{ position:relative; display:inline-block; margin-right:3px; } @keyframes shahir{ 0% { transform: translateY(0px) rotate(0deg); } 40% { transform: translateY(0px) rotate(0deg); } 50% { transform: translateY(-50px)rotate(180deg);; } 60% { transform: translateY(0px)rotate(360deg);; } 100% { transform: translate(0px)rotate(360deg);; }} h1 span { animation: shahir 3s alternate infinite linear; } h1 span:nth-child(1) {color:pink; animation-delay: 0s; } h1 span:nth-child(2) {color:lightmaroon; animation-delay: 0.2s; } h1 span:nth-child(3) {color:red; animation-delay:0s; } h1 span:nth-child(4) {color:lightgreen; animation-delay: 0.4s; } h1 span:nth-child(5) {color:blue; animation-delay: 0.5s; } h1 span:nth-child(6) {color:purple; animation-delay: 0.3s; } T H A N K S

Corazon body { display: grid; min-height: 100vh; justify-content: center; align-content: center; background: repeating-linear-gradient(circle, white, yellow, red); background: repeating-radial-gradient(circle, white, yellow, red);}@keyframes heart-path { 99% { stroke-dashoffset: 0; fill: none; } 100% { fill: firebrick; }}


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